Authors
Yonit Hochberg, Dino Novko, Rotem Ovadia, Antonio Politano
Published in
Physical review letters. Volume 137. Issue 10. Pages 101802. Sep 04, 2026.
Abstract
We propose the use of several unconventional materials as detectors for dark matter with mass beneath the MeV scale. These include the transition-metal dichalcogenide TiSe_{2} hosting a low-energy plasmon in the charge-density-wave phase, Sr_{2}RuO_{4} containing a low-energy acoustic demon mode, and hole-doped diamond with tunable optical and acoustic plasmon frequencies. We perform first-principles density functional theory computations of their loss functions at nonvanishing momenta and establish their reach into light dark matter parameter space. We show that due to intense low-energy plasmon modes-of different microscopic origin in each-the reach of detectors based on these materials could surpass existing proposals by several orders of magnitude for both dark matter scattering and absorption on electrons. The anisotropic response of these materials, which enables directional detection, renders them exceptionally strong detector candidates, motivating the design and fabrication of future devices.
PMID:
42758987
Bibliographic data and abstract were imported from PubMed on 19 Sep 2026.
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